172716538789 has 2 divisors, whose sum is σ = 172716538790. Its totient is φ = 172716538788.

The previous prime is 172716538769. The next prime is 172716538829. The reversal of 172716538789 is 987835617271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117277481764 + 55439057025 = 342458^2 + 235455^2 .

It is a cyclic number.

It is not a de Polignac number, because 172716538789 - 2⁷ = 172716538661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172716538789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172716538769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86358269394 + 86358269395.

It is an arithmetic number, because the mean of its divisors is an integer number (86358269395).

Almost surely, 2^172716538789 is an apocalyptic number.

It is an amenable number.

172716538789 is a deficient number, since it is larger than the sum of its proper divisors (1).

172716538789 is an equidigital number, since it uses as much as digits as its factorization.

172716538789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35562240, while the sum is 64.

The spelling of 172716538789 in words is "one hundred seventy-two billion, seven hundred sixteen million, five hundred thirty-eight thousand, seven hundred eighty-nine".